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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9556d052b4982619ab759f407e6effb2688eb21fb6de68f68f892848da2b45ab' 
  AND token = '0yTTd+Ot5Mz9uiaI4raQpetuNaJesVbA6xbzLDDPC+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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