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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15f6c581b0f08f66180ab76a9fb273c0eb1262a10cd314f74d6806478662d97' 
  AND token = 'l0JR82K5HkzZWn0s74Dq2M40ry3b1r/vUs/RvzxMeAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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