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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63cfe3827dfc24017c8da23faced595cd1878837200fdd26684825a48a5ed3d1' 
  AND token = 'LAzzLtxibp15gfYVs7Dg7GO3hmAgbwd1NES1nHiz+Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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