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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c81a3ca2e3b941a1341ac5a44293a7350d55ea153c92ecd47a2974384fce35b' 
  AND token = 'cAPAeazg04ABD8q3XGb4yZahquORyxbHFjUL2U5jAZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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