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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3948b40e902bc7cb5694fd12c75a4004feda9140f31d13a71efa5dd1ceff81' 
  AND token = '5NbUoA9IeW7lW8cEWveV30vGvAX1o4k9J59R9M24ewc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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