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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55d6fb540b36a0bfb09f136e9f061346be16a87f2fbe915676a6e85386bc605' 
  AND token = 'mtMStoKap1r3yoHqtxSCALkz8yT47rfuR5PniAePuV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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