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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '380de9ca7f47b9a99aa3e47e6105d01c82cdf3927af415b56f21ac86ee08a55c' 
  AND token = 'RX1irbMU5MdZfyQ6OJsCpkSyvstv/QrOorR6Tgfvw1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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