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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab49bf80c17d720cd85658b1dda6080a4c47cf4995be4d9763a784886e4743f' 
  AND token = 'Ej9fy+n6BnfpajYu4zFnSfLgerY1QHiIVb3a47iFj9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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