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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e0df8689f7ab9f19b84bb95b3df8cb81c979369b70d99cae94c707ff15ec31f' 
  AND token = 'hW04GZSW4vOi+W6vDgislr3ZX6aNx+WPOp2QUq2lLjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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