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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f9e9c2b2197eab07c259c20fdc0a4abc698b7d98021c4478f3b248273efbcd' 
  AND token = 'CkItomZjdUWV1W4q7Dsv2dgs6PWEuwrzeoh0TewLxe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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