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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7f5154fc1c981305f835981fb6ca91e030301074942c22383b67ef7be99103' 
  AND token = '7ACdjpVnL6E1X9ht0p/fUrEk/L/zx2yuo4dx98uQU9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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