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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccd8aa48de66c8c3a5df083d29caca561c8ada4b704de985d7755ddacd2eb94' 
  AND token = '14uC6oim/CptI+D2Z14JpIgPl8i4L21zXcTZAJ5HB2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}