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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b073c5195bd4af35d6c2fc74f7e90229c615172199f6f538d8636cc99f8f0b' 
  AND token = 'q4/BQ0xHT4HJZDI73dy+EqwRy50cb6gdLwGxVID8x3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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