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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7913b91c10d4ea1b0fb17acbd2a16a21d766d777ca216c58eb28537eb4f53e95' 
  AND token = 'zak4TYrL4tggR2tjub/Hu0JMALamX9C8YvDSQ6++ngs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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