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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f410c661dd218bac61ee43c400d85881429aecd33d848c1aef65fdda6ece9297' 
  AND token = 'eo6PYPbSrvCDlNYX0/OEr7T5772zt72JfL2Eaxy6hXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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