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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e0077607dc12b52d4c9ff788dc45081aedfc56327bb62070fe248107b54e3a' 
  AND token = 'sxSOwobn/asT1R8OpMXfZ2ZQFXnrSPC3hj3dUqp2zQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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