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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce1272149e2992a950ecb03608aef5be5185792741fb5f0e378ccd4592f381c7' 
  AND token = 'H866fXfgKYko55dGpPPM6nZKxr52oVJv8kjUQ+6Ci5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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