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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71d25643e8dc95f88e6cd15bdfdbf5adc3ee9c9477bc6bf6b974c395151a0fc' 
  AND token = 'eUGGWFVZJShhocmgoWJc0O1R+id+gVB/m9jcanU3gmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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