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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc73fe7530cccfafc58efac22fec3a7fc66898f6a0574e210190228bc279b11' 
  AND token = 'sudk68JjDX3YoUu8O5DIsoNU9w9L5hI+pQNEf16Tg/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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