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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e86c6c5e41b4ac6935e9b5b6eebae4974f1c475cb74e2033d44b01ecf8cb3ad' 
  AND token = 'wxqjl/bLZr1xV/YC2wniIiQZ94H8hhTF8Hh++30bWnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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