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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f17174f81bf2cc860d1056a713b3298345b20b69ec6181b61c0ad5c0792bf30' 
  AND token = 'DiZEHHs6j1N2akRjD2zpRbve9BCPGNi2/2MJO34VAqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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