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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9bdfef33f6f20724021f259c14865f9874fc7927c6e9c782cb54c8a20436ed' 
  AND token = '4M4rSI4inGfryw23dnqk4z+PJ36egF5IDAE5AXJweOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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