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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867c8895b27958b50cac853911d68ba03e6d81369df4e92c00c3b8483101cccb' 
  AND token = 'JNi4WU/LNMvG7w72wtiuafJVXGXVmcotVLt9X9wDGRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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