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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f7f71112255ebaaacc5c4deb5c374081a47ddc89e5af97ab7f24b2b3820a17' 
  AND token = 'H/2W4lHCn1Wp8SnsEZLV7Z4fCZe43khoZX4I/HzJC2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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