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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f9585b62507edab30f8446d7cc86f91b21678b6fc9a8331031802a0373a3d7' 
  AND token = 'SY5IfHY/QaMjOFRahGMMM9800wZdsOsjQi/739XOYO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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