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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8497f21a9bd24a18d7734f56a2fe77bc431b12a97761ef8e4b04eeeadc3a52' 
  AND token = 'Z/1L3YWXh9Q1a80fDp2aNLSZr6iHeZmslfEI3fz5js4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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