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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec173d5605cedb2e2a4540c39fca79f319a06a80c7d73a74874a69c9308cbb34' 
  AND token = 'VaFRYX1jvjtSr17cF2Of75O2vOc+pcAVD/uiT/0JIRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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