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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff55a8411cea3af1d0cafa3b73644fdb6ff0942e8ced023c582a184624b6b12' 
  AND token = 'HPr+mGPFGOQfwaOKtJbAkg7n2aJmg3hYCaP4oYG9YoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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