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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8939d6b201998b7c8373c9f51ca1531ca23b386fff81ef9aa4094398b92c14f' 
  AND token = 'lWjZt3+GT3ch2LpAiu0dff74mUp0n/IOwd46J5/3ROQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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