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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca7cc8e15f10b365911aee100627c60eb7b41664583bffc948790504507e47d' 
  AND token = 'CIZ0lamhHS3HRKOQD4SIR7ObzJnmf9R4bb8jxdGUSVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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