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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbb755819adc821cd8107239de0162c7c01f81e35d1013e280a3b06b22f8bf3' 
  AND token = 'ryGrTPSQIGYg4QVGgP4Y2xIlIUQBym976hysTm3apTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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