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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c093d43ef081216b3954550b79d8f97dd10017bab5e0f859eb35cee9f2fd94' 
  AND token = 'B1bGnutJeAmdqMhEfkK7FE9/DEqlYl3Lzmhn8r8tZbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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