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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4476f6697892f0aa84eb07b6e5d8ad2bb3f260790c4035d63052b471697eb22' 
  AND token = 'gv7MwIXTm0B3BYjnIqfnh7KG0r7AmMUxedvrL/ePU6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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