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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea0b30913579d9ca0cc51548b55a50b1eb22eb456b296714e2ea0dc73d79298' 
  AND token = 'GpY6DucYW0DBmmdGbsVGljaHRGtEWmfpKvw+YsH3rEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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