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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc2e3760ffa1fde7409520aea379adaaa7a6f471e4736329668eec305e926b0' 
  AND token = 'qDs3ggPTgo04c4QVB7VS/dmN3QKbdz99d45lo1eH0r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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