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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2b458b585798f4f3f3b523b232b1baa65776423dfd048b84eb88e36b094102' 
  AND token = 'Gr48/rYja+d8facX1fA6BwM6DNhIKHfNo13Wu+9DvfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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