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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f059a1b0aa7f72f95d0ba5e4ff204033148a79552d889e8188e039ea51b418a4' 
  AND token = '3rWJZt+h1uS2xX2kZ9Up5oEyJKM1iGUMcmTfDms73lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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