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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99ec196f57361d0b2c61b886e6ad14f624b7a78ef3269a802e507820fed9087' 
  AND token = 'rSKmU+95cZglCt6ngWAq+foMFMRg1je+B4+ex5wakAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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