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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228d479e3ca904c675f8aebaf96353ca3c601c3cf500cc9a9195a235fd2538d0' 
  AND token = 'a6WW09Nxm2MDLtdPUbhzcVd+hULx89k68E3iGk0BpHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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