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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9654470cebce0b0b5533aed8d1677b719f9c10dddd557e96d4bd0123c4ab50' 
  AND token = '47Ioks2bPnMTDZxN6IW5pKA6Ar4S2YXZOVhKLMTL0NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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