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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b8e2d8589ccb82e4683b87f5185d5db9f48b6afb9f01490c9ddcce5340f499' 
  AND token = 'vBHG63ShQijs1zUMCYmfeIaDSLFxL59zU6GoDi2PN04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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