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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb7265d5c8ead25a90b05ce41823326d33710b92d256ac267e123b62e93e2d1' 
  AND token = 'v2L/gbj0YYY+O9BEdF6XCzCGKE9eZY24bxG7YiT2Iu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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