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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9ae72a0026608ee21cdce9102135bb0f4a139bd00410d68049a5616c28dbce' 
  AND token = 'E0NmgoCtve8ZZ+27T3luA/z1lFFsJxRueBkbhKFdnqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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