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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b58392895d0e60ad3140923197ee155b23d434c5ddd22a6de09983129673b1' 
  AND token = 'z/sk8l+e4TRCxSZXhtGMW3AX1FR9jRZ2hj3h2C4w8oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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