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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79717d1c6151155994112f7d6026de9cd5b3eaf8ab8d93af0f670f473c702655' 
  AND token = '+U2tq5MIf7kQreshZ0RUKR1+9iMN5uGyXEolO0AGFgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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