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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2427613e70cd9d5a935123a57356120fbf39471badeb87872adb8b4a0707e503' 
  AND token = '85QF70p5aiO7Bf5h9L4esk/VH45KMYHLtbfPTX5ON4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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