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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bca474bb1963d1570bd6fa5bea0d694f7c35cadfc588c10e3c7b22ece606084' 
  AND token = 'SzUzQgeemwGxKmevGAG9biuMPMGO6/GnK27fn/n4rsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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