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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ddbccc7cbb0e3ba15f645a0531fca0798a98a932e8fc66c178b85c3bccf3e15' 
  AND token = 'puGt0q1xn2LO9Ukz/B2AE+Xap3a6FD2HAvZcFnVO3Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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