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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6fddc882d0e4df2b20394b35d642b684ce6eb4024e65f3ba13a2d24b8d69c1' 
  AND token = '0i54oQgA8I7VxrCKiU6Mm9BAkomwBba+wh22SzOZBOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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