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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b0976fc1f5bc49378feb07ce46b90fe2ea1bd1263f69f8c049a1e6d9f109dd' 
  AND token = 'pBIvDGeVUhVOCDdp27E3KlvAMJ/sSk1v751YcOipgyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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