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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19201ee25a3d616111b7ca17c0ba9b1e928bcaad439902c436289ab3f340557e' 
  AND token = '2B+MnVzn+YEehjAV4HdaVoxey/xxJpkRyr8h11YLlBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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