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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f47edfe3f4e80813643b1dd7972da723f3faae2b3bfc3c9b31fb9cb34652e6' 
  AND token = 'XNLGD44ZBeYu8cqFEszCHlw9ZmZprFfg8F0mUx68S/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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