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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a5bafd016fd25c52671ed75c46c5326b1dbd6ed996c4406eaf523ff9516837' 
  AND token = 'ZvcAidmjXrd8bZ0pR9Ik5vfGg9e2cju916YLIS8l3IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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