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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658a0b616f8e4aa6388a24fa55ef3512bf126643c4237c627fb561db93ae213d' 
  AND token = '4OrwVjEtkAEeH17+EmfV57g3lHLYvcYYqADdyQm0MnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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