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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f2c43acdef35a44e4d7d891db0e851dbdd1148b2f8fea39542bef8c2851a55' 
  AND token = 'gzsz70//nzLx8Lsx4S0goAAkLQLLP+jhwf++JQj7Ofg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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