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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632a25e5adc7711119174fc2ed98479a28dc4947791b0671f3e6da199e11c0bb' 
  AND token = 'yET3VarDvCfYycM3ijc86jI6XnrLcti3jceJ5kgvICg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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