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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e54a112f0be2a7eb2377ded19a52b1d746e7b8cf0e42329d862ba2ea3f253e' 
  AND token = '4XZdWnzeRqdLWAfZhXww3GPSyvensemSHqyUSkh6Fs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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