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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c62fd70455635e198f3405bafce9153e276581293dcae6762a87a88c21ff298' 
  AND token = '55rAf6hkiB1UQFqLprq2YCrJ9rTNzEK9Hp3jgCAu7Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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