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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ce2dbba9e9ea633c781d64b078a049128f7caa208fa393c2867cf6a80f52b3' 
  AND token = 'Btc0aKY8DwWVuxmkIe/9MFtFvrR3kdPV+QUduuo6t+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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