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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804c5f3be258c89ae20aea91f3a5aad27dc16594441ddc1c4aea436fd022cf7a' 
  AND token = 'bjJ5+vTBbXFWj4c6e/jtXD84Ho07p8ZqHhqSFCnjtXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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